[ENH] Add 2015 reconstruction of BigBrain as a template coordinate space

[dickscheid]

I propose to add BigBrain as a known template space. This will help us to properly model a couple of incoming EBRAINS datasets in a BIDS conform way.

[effigies]

Glossary entry:

Coordinate systems table:

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 82.71%. Comparing base (df8a853) to head (f5ac38e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2151   +/-   ##
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  Coverage   82.71%   82.71%           
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  Files          20       20           
  Lines        1608     1608           
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  Hits         1330     1330           
  Misses        278      278           

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